It has been two weeks since new PM2.5 emissions standards took effect.
The new tolerance levels prescribed by the Pollution Control Department are encouragingly more stringent and cap the permissible daily average PM2.5 fine dust level at only 37.3 microgrammes per cubic metre (µg/m3) of air, a significant reduction from the previous 50 µg/m3. The new annual target is an average of just 15 µg/m3, against the earlier 25 µg/m3.
